Urban rivers as hotspots of regional nitrogen pollution

Zhang, Xiaohong; Wu, Yabin; Gu, Baojing

doi:10.1016/j.envpol.2015.05.031

Cited by 113 publications

(50 citation statements)

References 31 publications

(42 reference statements)

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“…The higher concentration of NH 3 -N was observed at stations TB3 (Jasar River) and TB2 (Ruil River) located around Tanah Rata town and small Ruil villages ( Figure 2H). The discharge of untreated domestic sewage to the river might be the reason behind such increment (Zhang et al, 2015). TN showed increased concentrations at station TB3 (Jasar River) and TB4 (Batu Pipih River) relating to their higher concentrations of NH 3 -N and NO 3 -N respectively.…”

Section: Resultsmentioning

confidence: 97%

Spatial and Temporal Variation of Water Quality in the Bertam Catchment, Cameron Highlands, Malaysia

Rasul

Islam

Yunus

et al. 2017

Water Environment Research

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The spatio-temporal variability of water quality associated with anthropogenic activities was studied for the Bertam River and its main tributaries within the Bertam Catchment, Cameron Highlands, Malaysia. A number of physico-chemical parameters of collected samples were analyzed to evaluate their spatio-temporal variability. Nonparametric statistical analysis showed significant temporal and spatial differences (p < 0.05) in most of the parameters across the catchment. Parameters except dissolved oxygen and chemical oxygen demand displayed higher values in rainy season. The higher concentration of total suspended solids was caused by massive soil erosion and sedimentation. Seasonal variations in contaminant concentrations are largely affected by precipitation and anthropogenic influences. Untreated domestic wastewater discharge as well as agricultural runoff significantly influenced the water quality. Poor agricultural practices and development activities at slope areas also affected the water quality within the catchment. The analytical results provided a basis for protection of river environments and ecological restoration in mountainous Bertam Catchment.

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Section: Resultsmentioning

confidence: 97%

Spatial and Temporal Variation of Water Quality in the Bertam Catchment, Cameron Highlands, Malaysia

Rasul

Islam

Yunus

et al. 2017

Water Environment Research

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“…Excessive NH 4 + input in the rivers has caused eutrophication and decreased water quality during the past several decades (Yu et al, 2015). Therefore, the nitrogen biogeochemical processes are of great concerns in the urban riverine environments.…”

Section: Introductionmentioning

confidence: 99%

Ammonium Production and Removal in the Sediments of Shanghai River Networks: Spatiotemporal Variations, Controlling Factors, and Environmental Implications

Lin

Gao

et al. 2017

JGR Biogeosciences

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Ammonium (NH4+) pollution and associated processes causing environmental problems in aquatic ecosystems have attracted much attention. However, the microbial pathways of NH4+ production and removal and associated influencing factors in the sediments of urban rivers remain unclear. In this study, microbial pathways of NH4+ production and removal were quantified to examine the NH4+ balance in the sediments of Shanghai river networks. The results indicated that potential rates of gross nitrogen mineralization, dissimilatory nitrate reduction to ammonium, and nitrogen fixation ranged from 0.25 to 25.83 μg N g−1 d−1, from undetectable to 3.47 μg N g−1 d−1, and from 0.07 to 3.05 μg N g−1 d−1, respectively. The potential rates of gross NH4+ immobilization, anammox, and nitrification, as the NH4+ removal processes, ranged from 0.24 to 26.27 μg N g−1 d−1, from 0.01 to 7.97 μg N g−1 d−1, and from 0 to 9.62 μg N g−1 d−1, respectively. Temperature, dissolved oxygen, NO3−, NH4+, and total organic carbon had great influences on these NH4+ production and removal processes. In addition, the total amounts of NH4+ production and removal through microbial pathways in sediments of Shanghai river networks were estimated at approximately 2.6 × 105 t N yr−1 and 3.9 × 105 t N yr−1, respectively. Thus, the net sink of NH4+ was 1.3 × 105 t N yr−1, which accounts for 22% of total inputs of nitrogen in the river networks. These results indicate that microbial processes of removal in sediments can eliminate significant parts of NH4+ generated from microbial pathways and/or inputs from anthropogenic activities in urban rivers. Overall, these results improve understanding of NH4+ production and removal and associated influencing environmental factors and highlight the environmental importance of these processes in regulating the NH4+ budget in highly urbanized riverine ecosystems.

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“…Since, it has enormous temporal and spatial variability in terms of quantity and quality (Ababaei and Etedali, 2014;Guobin et al, 2013). Furthermore, point and diffuse load pollution to rivers, lakes and groundwater supplies (He et al, 2011;Eriksen et al, 2013;Goher et al, 2014;Grondona et al, 2014;Zhang et al, 2015), intensive water consumption (Mekonnen and Hoekstra, 2010), emitting CO 2 and toxic gases to the atmosphere (Lin and Liu, 2015;Shahbaz et al, 2015), global warming (Gohari et al, 2013;Ivner and Viklund, 2015;Jahani et al, 2016), more frequent droughts (Nalbantis and Tsakiris, 2009;Tigkas et al, 2012), etc. have put more stress on the scarce resources of fresh water (Herrera-Pantoja and Hiscock, 2015;Touhami et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Reduction of Sugarcane Water Footprint by Controlled Drainage, in Khuzestan, Iran

Jahani

Mohammadi

Nasseri

et al. 2017

Irrigation and Drainage

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The main objective of this study was to estimate the different components of the water footprint for sugarcane production under the conditions of free (FD) and controlled drainage (as an on‐farm strategy for agricultural water management, CD) in an arid and semi‐arid region in the south‐west of Iran (Khuzestan Province). The different components of the water footprint (green, blue and grey) were assessed based on on‐farm measurements. The total amount of water footprint for sugarcane production in the study area stood at 250 m3t−1 in the treatment FD. Of this, 12.2, 71.8 and 16.0% were of the green, blue and grey water footprints, respectively. By using CD this value was reduced to 203 m3t−1 in total, of which, 13.7, 76.8 and 9.5% were of the green, blue and grey water footprints, respectively. This decrease in the amount of water footprint seems to be mainly a result of an increase in crop productivity (due to soil condition improvement), reduction of the in‐ and outflow of the sugarcane farm and also reduction of nitrate losses in the CD treatment. Copyright © 2017 John Wiley & Sons, Ltd.

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Urban rivers as hotspots of regional nitrogen pollution

Cited by 113 publications

References 31 publications

Spatial and Temporal Variation of Water Quality in the Bertam Catchment, Cameron Highlands, Malaysia

Spatial and Temporal Variation of Water Quality in the Bertam Catchment, Cameron Highlands, Malaysia

Ammonium Production and Removal in the Sediments of Shanghai River Networks: Spatiotemporal Variations, Controlling Factors, and Environmental Implications

Reduction of Sugarcane Water Footprint by Controlled Drainage, in Khuzestan, Iran

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